Digital Folders are die-cut before they are printed on our digital press. That means die-cut lines are not required on the print files. Templates contain guides on the Finishing Layer to indicate the die-cut elements of the Folders to help you layout your design, these guides are stripped out when preflighted and will not be present on the print ready PDF.
There is a 10 mm non-printable area around each panel, which results in a thin white border on each panel. The white frames are the non-printable areas, artwork must not enter these areas:

There are quiet zones around the interlocking flaps and business card slots (shown above), we recommend that artwork stays clear of these zones or unpredictable results could occur.